At Microsoft, operating income at its entertainment and devices division, which houses the Xbox and its Windows smartphone efforts, plunged 71% in its fiscal 2012 year to $ 364 million, and below what it was in 2010. As the Xbox has aged, the number of ...<p><a href="http://online.wsj.com/article/SB10001424127887323398204578489710767303392.html">Keep reading...</a></p>